Remove dirs #410

Job	Run time
install-cross (linux-musl)	5s
macos (stable, x86_64-apple-darwin)	45s
macos (beta, x86_64-apple-darwin)	51s
macos (nightly, x86_64-apple-darwin)	51s
linux (stable, arm-unknown-linux-gnueabi)	1m 9s
linux (stable, armv7-unknown-linux-gnueabihf)	1m 11s
linux (stable, i686-unknown-linux-musl)	1m 13s
linux (stable, x86_64-unknown-linux-musl)	1m 29s
linux (stable, aarch64-unknown-linux-gnu)	1m 4s
linux (stable, aarch64-unknown-linux-musl)	1m 9s
linux (stable, arm-unknown-linux-gnueabihf)	1m 7s
linux (beta, arm-unknown-linux-gnueabi)	1m 12s
linux (beta, armv7-unknown-linux-gnueabihf)	1m 12s
linux (beta, i686-unknown-linux-musl)	1m 16s
linux (beta, x86_64-unknown-linux-musl)	1m 19s
linux (beta, aarch64-unknown-linux-gnu)	1m 14s
linux (beta, aarch64-unknown-linux-musl)	1m 18s
linux (beta, arm-unknown-linux-gnueabihf)	1m 11s
linux (nightly, arm-unknown-linux-gnueabi)	1m 13s
linux (nightly, armv7-unknown-linux-gnueabihf)	1m 12s
linux (nightly, i686-unknown-linux-musl)	1m 25s
linux (nightly, x86_64-unknown-linux-musl)	1m 15s
linux (nightly, aarch64-unknown-linux-gnu)	1m 12s
linux (nightly, aarch64-unknown-linux-musl)	1m 16s
linux (nightly, arm-unknown-linux-gnueabihf)	1m 15s
	28m 24s

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